Pregnancy Due Date Calculator

Pregnancy timeline and due date calculations

Estimated Due Dates (EDD) are typically projected using Naegele's Rule, which assumes a baseline of 280 days from the first day of the Last Menstrual Period (LMP). Dating scans using ultrasound imaging calculate gestational age by measuring crown-rump lengths in early weeks to verify the timeline.

IVF embryo transfer calculations adjust based on day count: Day-3 transfers subtract 17 days, while Day-5 transfers subtract 19 days to establish equivalent LMP baselines. Standard trimesters subdivide development into 13-week milestones.